feat(presets): add Code0.ai partner preset for 7 apps

Partner aggregator (New API gateway) across Claude Code, Claude Desktop,
Codex, Gemini, OpenCode, OpenClaw, and Hermes. Claude Code, Claude
Desktop, and Gemini use the bare host (gemini-3.1-pro-preview for
Gemini); Codex, OpenCode, OpenClaw, and Hermes use /v1 with gpt-5.5.

Marks isPartner with ?source=ccswitch attribution on apiKeyUrl only
(website URL stays clean). Adds the partnerPromotion blurb in all four
locales and a sponsor row in all four READMEs. Positioned after
ClaudeAPI in the Claude Code and Claude Desktop lists (the two apps
that carry a ClaudeAPI preset). Registers the favicon-derived code0.png
icon via URL import; the README banner is normalized to the standard
1920x798 aspect ratio.

src/icons/extracted/index.ts

@@ -9,6 +9,7 @@ import _byteplus from "./byteplus.png";
 import _ccsub from "./ccsub.svg?url";
 import _claudecn from "./claudecn.png";
 import _cherryin from "./cherryin.png";
+import _code0 from "./code0.png";
 import _eflowcode from "./eflowcode.png";
 import _etok from "./etok.png";
 import _fenno from "./fenno-icon.webp";
@@ -108,6 +109,7 @@ export const iconUrls: Record<string, string> = {
   claudeapi: _claudeapi,
   claudecn: _claudecn,
   cherryin: _cherryin,
+  code0: _code0,
   eflowcode: _eflowcode,
   etok: _etok,
   fenno: _fenno,

src/icons/extracted/metadata.ts

@@ -211,6 +211,13 @@ export const iconMetadata: Record<string, IconMetadata> = {
     keywords: ["cloudflare", "cdn"],
     defaultColor: "#F38020",
   },
+  code0: {
+    name: "code0",
+    displayName: "Code0",
+    category: "ai-provider",
+    keywords: ["code0", "code0ai", "aggregator", "relay", "gateway", "gpt"],
+    defaultColor: "#20C050",
+  },
   cohere: {
     name: "cohere",
     displayName: "Cohere",